Add event context

[ffjlabo]

What this PR does:

Modified the pipectl event register command to allow adding metadata to events.
The metadata added to events will be included as trailers in commits created by the event watcher.

How to

• When the event watcher creates a commit, it adds the values of the contexts attached to the event as trailers
• PIpeCD only references the manifest repo, so it was necessary to add information to the manifest repo

Why we need it:
We want to check the source code links from the commits in the manifest repo.

Which issue(s) this PR fixes:

Part of #5028

Does this PR introduce a user-facing change?:

• How are users affected by this change:
• Is this breaking change:
• How to migrate (if breaking change):

[t-kikuc]

good

[Warashi]

👍🏻

[codecov]

Codecov Report

Attention: Patch coverage is 20.58824% with 27 lines in your changes missing coverage. Please review.

Project coverage is 24.39%. Comparing base (4ebcb7c) to head (9c9aff8).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/app/piped/eventwatcher/eventwatcher.go	0.00%	8 Missing ⚠️
pkg/app/pipedv1/eventwatcher/eventwatcher.go	0.00%	8 Missing ⚠️
pkg/app/pipectl/cmd/event/register.go	0.00%	5 Missing ⚠️
pkg/git/gittest/git.mock.go	0.00%	4 Missing ⚠️
pkg/app/server/grpcapi/api.go	0.00%	1 Missing ⚠️
pkg/git/repo.go	87.50%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5295      +/-   ##
==========================================
+ Coverage   24.37%   24.39%   +0.01%     
==========================================
  Files         443      443              
  Lines       46927    46936       +9     
==========================================
+ Hits        11439    11449      +10     
+ Misses      34577    34576       -1     
  Partials      911      911              

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[khanhtc1202]

LGTM 👍

[ffjlabo]

📝 The sample for how the GitHub shows the trailers

1. Execute pipectl event register with --contexts option. We can set some values for the event.

pipectl event register --address=xxx --api-key=xxx --name=simple --data="gcr.io/pipecd/helloworld:v0.49.0" --contexts=Source-Commit-Hash= 6512b1f3fcba7342c11cf96968e753c78e66561b,Source-URL=https://github.com/pipe-cd/pipecd/commit/6512b1f3fcba7342c11cf96968e753c78e66561b,PipeCD-Official-Docs=https://pipecd.dev/

2. Event Watcher makes a commit and sets these values as trailers.

commit 5fd3fdb367ac048fcae8533c5ea76d62e8e8998f (HEAD -> main, origin/main, origin/HEAD)
Author: Yoshiki Fujikane <[email protected]>
Date:   Mon Oct 28 15:45:55 2024 +0900

    Update image version

    Source-Commit-Hash: 6512b1f3fcba7342c11cf96968e753c78e66561b
    Source-URL: https://github.com/pipe-cd/pipecd/commit/6512b1f3fcba7342c11cf96968e753c78e66561b
    PipeCD-Official-Docs: https://pipecd.dev/